000 00302nam a2200121Ia 4500
008 220901s2017 xx 000 0 eng d
082 _a371.102 MAN
100 _aMangal, S.K.; Mangal, Shubhra
245 0 _aLearning and Teaching
260 _bDelhi: Shipra
_c2017
300 _a342
942 _2ddc
_cREF
_02
999 _c6388
_d6388